Number of self-complementary graphs with n nodes.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =0a(6) =0a(7) =10a(8) =36a(9) =0a(10) =0a(11) =720a(12) =5600a(13) =0a(14) =0a(15) =703760a(16) =11220000a(17) =0a(18) =0a(19) =9168331776a(20) =293293716992a(21) =0a(22) =0a(25) =0a(26) =0a(29) =0a(30) =0